Tetrahydrofuran → tert-butyl N-[4-(isopropylformylamino)cyclohexyl]methylcarbamate

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A solution of a tert-butyl N-[4(isopropylamino)cyclohexyl]methylcarbamate (7.89 mmol, 1 equivalent) in 5 ml of THF was added dropwise to a solution of 1H-benzotriazole-1-carboxaldehyde (8.68 mmol, 1.2 equivalent) in 10 ml of THF at room temperature. The reaction mixture was stirred overnight and then heated at reflux temperature for two hours. 1H-benzotriazole-1-carboxaldehyde (additional 1 equivalent) was added to the reaction mixture and stirred overnight. The solvent was removed in vacuo and dichloromethane was added to the residue. The organic phase was washed with 2N NaOH solution, saturated NaCi solution, dried over Na2SO4, and the solvent removed in vacuo. The residue was then chromatographed to give tert-butyl N-[4(isopropylformylamino)cyclohexyl]methylcarbamate: 100% yield, 299 (ESMS, MH+); 1H NMR (CD3OD) δ 8.22 & 8.18 (two s, 1H), 4.63 (broad, 1H), 4.30 & 3.60 (two m, 1H), 3.76 (m, 1H), 2.99 (m, 2H), 1.44 (s, 9H) 1.27 (d, 3H, J=6.5 Hz), 1.21 (d, 3H, J=6.5 Hz), 1.91-0.82 (m, 9H).

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